.nav_container{
  width: 100%;
  height: 500px;
}
.nav_container img{
  width: 100%;
}
.nav_container .swiper-slide{
  background-size: 100% 100%;
}
.slide_01{
  background: url('https://img.alicdn.com/imgextra/i3/O1CN01Am8Sra21Zaice06ax_!!6000000006999-2-tps-1130-500.png_q100.jpg_.webp') no-repeat center center;
}
.slide_02{
  background: url('https://img.alicdn.com/imgextra/i4/734584252/O1CN01nSJdgk1hHSm5FiySs_!!734584252-0-alimamazszw.jpg') no-repeat center center;
}
.slide_03{
  background: url('https://img.alicdn.com/imgextra/i4/6000000002376/O1CN01ADmQzf1TQFkmf4Wqs_!!6000000002376-0-octopus.jpg') no-repeat center center;
}
.slide_04{
  background: url('https://aecpm.alicdn.com/simba/img/TB1_JXrLVXXXXbZXVXXSutbFXXX.jpg') no-repeat center center;
}
.slide_05{
  background: url('https://img.alicdn.com/tfs/TB1_1OLxQL0gK0jSZFtXXXQCXXa-1130-500.jpg_q100.jpg_.webp') no-repeat center center;
}
.slide_06{
  background: url('https://img.alicdn.com/tps/i4/i3/6000000003435/O1CN01fS1G4M1bFHA2rvIwi_!!6000000003435-0-ald.jpg_q100.jpg_.webp') no-repeat center center;
}